<?php
/*
	+-----------------------------------------------------------------------------+
	| ILIAS open source                                                           |
	+-----------------------------------------------------------------------------+
	| Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
	|                                                                             |
	| This program is free software; you can redistribute it and/or               |
	| modify it under the terms of the GNU General Public License                 |
	| as published by the Free Software Foundation; either version 2              |
	| of the License, or (at your option) any later version.                      |
	|                                                                             |
	| This program is distributed in the hope that it will be useful,             |
	| but WITHOUT ANY WARRANTY; without even the implied warranty of              |
	| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
	| GNU General Public License for more details.                                |
	|                                                                             |
	| You should have received a copy of the GNU General Public License           |
	| along with this program; if not, write to the Free Software                 |
	| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
	+-----------------------------------------------------------------------------+
*/

include_once('./classes/class.ilObjectAccess.php');

/** 
* 
* 
* @author Stefan Meyer <smeyer.ilias@gmx.de>
* @version $Id$
* 
* 
* @ingroup ModulesCourseReference
*/

class ilContainerReferenceAccess extends ilObjectAccess
{
	/**
	* checks wether a user may invoke a command or not
	* (this method is called by ilAccessHandler::checkAccess)
	*
	* @param	string		$a_cmd		command (not permission!)
	* @param	string		$a_permission	permission
	* @param	int			$a_ref_id	reference id
	* @param	int			$a_obj_id	object id
	* @param	int			$a_user_id	user id (if not provided, current user is taken)
	*
	* @return	boolean		true, if everything is ok
	*/
	public function _checkAccess($a_cmd, $a_permission, $a_ref_id, $a_obj_id, $a_user_id = "")
	{
		global $ilUser, $lng, $rbacsystem, $ilAccess, $ilias;

		if ($a_user_id == "")
		{
			$a_user_id = $ilUser->getId();
		}

		return true;
	}
	
	/**
	 * Check if target is accessible and not deleted 
	 * @param int $a_ref_id ref_id
	 * @return bool
	 * @static
	 */
	 public static function _isAccessible($a_ref_id)
	 {
	 	global $ilDB,$tree;
	 	
	 	$obj_id = ilObject::_lookupObjId($a_ref_id);
	 	$query = "SELECT target_obj_id FROM container_reference ".
	 		"WHERE obj_id = ".$ilDB->quote($obj_id)." ";
	 	$res = $ilDB->query($query);
	 	while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
	 	{
	 		$target_id = $row->target_obj_id;
	 	}
	 	$target_ref_ids = ilObject::_getAllReferences($target_id);
	 	$target_ref_id = current($target_ref_ids);
	 	return !$tree->isDeleted($target_ref_id);
	 }
} 
?>